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  • 會議論文

超音波檢測混凝土圓柱試體之完整性

摘要


本文研究的主要目的是利用超音波方法非破壞性檢測混凝土圓柱試體之完整性,採用ULCON3型的超音波檢測儀及500kHz接觸式直束探頭,配合TestPro之C-SCAN軟體進行C掃描及量測波速的方式,施行超音波方法非破壞性檢測水灰比為0.5及0.6兩種情況下之直徑分別爲如與15公分而長度均爲20公分之混凝土圓柱試體,澆灌成完整、裂縫、空洞、蜂巢等四種混凝土圓柱試體,以回波振幅圖及波速法評估混凝土圓柱試體的完整性。研究結果顯示,裂縫是音能發散的主因,可由回波振幅法探查混凝土之完整與否;超音波會繞著空洞外圍行進,因而增加通行時間,使回波振幅的衰減量大增;而蜂巢的存在對於波速並無任何影響,但若使用回波振幅法則可確實檢測出蜂巢的位置。

關鍵字

混凝土 波速 回波振幅 空洞 蜂巢

並列摘要


The main purpose of this paper is to evaluate the integrity of concrete cylinder test using the ultrasonic technique. The ultrasonic tester(type ULCON3) and touched vertical beam dictator are used to measure the velocity and scan the surface of concrete cylinder test for predicting the crack, hollow and honeycomb in concrete. When the concrete is of defect, the ultrasonic wave propagation will change due to energy decay and velocity change. Based on the ultrasonic pulse velocity and amplitude, the concrete quality can be predicted. Some result obtained from this study are denoted as follows: (1) The scatter of sound energy is occured from crack in concrete, the concrete integrity can be predicted by the ultrasonic pulse amplitude, (2) When the ultrasonic wave propagates in concrete the pass time will increse due to hollow and the energy decay will also raise. (3) The honeycomb location can actually determined by the method of ultrasonic pulse amplitude.

並列關鍵字

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